The 99 would have come with a dipstick. Maybe the coolant tank has been replaced. When you buy a new tank these days, it doesn't come with the dipstick hole; that has to be cut out by the installer. I wonder if the dipstick tube is still there, behind the firewall in the engine compartment... Otherwise it should have been sealed in some fashion. I'd follow up on this if I were you.
Last edited by clickman; 11-12-2014 at 09:57 AM.